218164164 has 12 divisors (see below), whose sum is σ = 509049744. Its totient is φ = 72721384.

The previous prime is 218164153. The next prime is 218164181. The reversal of 218164164 is 461461812.

218164164 is nontrivially palindromic in base 5.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9090162 + ... + 9090185.

It is an arithmetic number, because the mean of its divisors is an integer number (42420812).

Almost surely, 2^218164164 is an apocalyptic number.

It is an amenable number.

218164164 is an abundant number, since it is smaller than the sum of its proper divisors (290885580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218164164 is a wasteful number, since it uses less digits than its factorization.

218164164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18180354 (or 18180352 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 218164164 is about 14770.3813085512. The cubic root of 218164164 is about 601.9972001650.

The spelling of 218164164 in words is "two hundred eighteen million, one hundred sixty-four thousand, one hundred sixty-four".